US5346792A
Expired / Lapsed
US
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Color toner
Assignee: Canon Inc
•
Filing: 1992-06-08
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Granted: 1994-09-13
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Expires: 2012-06-08
Abstract
Abstract A color toner is constituted to form a polyester binder resin and a colorant. The polyester resin is obtained from a monomer mixture including, at least: 25-35 mol. % of a dibasic aromatic acid component (a) selected from isophthalic acid, terephthalic acid and derivatives thereof; 2-4 mol. % of a tribasic aromatic acid component (b) selected from trimellitic acid and derivatives thereof; 12-18 mol. % of a dibasic acid component (c) selected from dodecenylsuccinic acid, octylsuccinic acid, and anhydrides thereof; and 45-60 mol. % of an etherified diphenol component (d) obtained by propoxidation or/and epoxidation, each percentage being based on a total of the monomers. The polyester resin is characterized by having a hydroxyl value of 10-20, a weight-average molecular weight (Mw) of 13,000-20,000, a number-average molecular weight (Mn) of 5,000-8,000, and an Mw/Mn ratio of 2-3.5.
Inventors
- 👤 Hiroyuki Kobayashi
- 👤 Takaaki Kohtaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:22
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08742; G03G9/08755; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/105
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
151 words
A color toner, comprising: a binder resin and a colorant; the binder resin comprising a polyester resin obtained from a monomer mixture including, at least: 25-35 mol. % of a dibasic aromatic acid component (a) selected from the group consisting of isophthalic acid, terephthalic acid and derivatives thereof, 2-4 mol. % of a tribasic aromatic acid component (b) selected from the group consisting of trimellitic acid and derivatives thereof, 12-18 mol. % of a dibasic acid component (c) selected from the group consisting of dodecenylsuccinic acid, octylsuccinic acid, and anhydrides thereof, and 45-60 mol. % of an etherified diphenol component (d) obtained by propoxidation or/and epoxidation, each percentage being based on a total of the monomers, wherein the polyester resin has a hydroxyl value of 10-20, a weight-average molecular weight (Mw) of 13,000-20,000, a number-average molecular weight (Mn) of 5,000-8,000, and a weight-average molecular weight/number-average molecular weight (Mw/Mn) ratio of 2-3.5.
Claim 2
Dependent Claim
151 words
A color toner, comprising: a binder resin and a colorant; the binder resin comprising a polyester resin obtained from a monomer mixture including, at least: 25-35 mol. % of a dibasic aromatic acid component (a) selected from the group consisting of isophthalic acid, terephthalic acid and derivatives thereof, 2-4 mol. % of a tribasic aromatic acid component (b) selected from the group consisting of trimellitic acid and derivatives thereof, 12-18 mol. % of a dibasic acid component (c) selected from the group consisting of dodecenylsuccinic acid, octylsuccinic acid, and anhydrides thereof, and 45-60 mol. % of an etherified diphenol component (d) obtained by propoxidation or/and epoxidation, each percentage being based on a total of the monomers, wherein the polyester resin has a hydroxyl value of 10-20, a weight-average molecular weight (Mw) of 13,000-20,000, a number-average molecular weight (Mn) of 5,000-8,000, and a weight-average molecular weight/number-average molecular weight (Mw/Mn) ratio of 2-3.5.
Claim 3
Dependent Claim
22 words
The color toner according to claim 1, wherein the binder resin comprises a crosslinked polyester resin having an Mw/Mn ratio of 2.0-3.0.
Claim 4
Dependent Claim
34 words
The color toner according to claim 1, wherein the binder resin comprises a crosslinked polyester resin obtained from terephthalic acid, trimellitic acid or trimellitic anhydride, dodecenylsuccinic acid or dodecenylsuccinic anhydride, and polyoxypropylene-2,2-bis(4-hydroxyphenyl)propane or polyoxyethylene-2,2-bis(4-hydroxyphenyl)propane.
Claim 5
Dependent Claim
34 words
The color toner according to claim 1, wherein the binder resin comprises a crosslinked polyester resin obtained from isophthalic acid, trimellitic acid or trimellitic anhydride, octylsuccinic acid or octylsuccinic anhydride, and polyoxypropylene-2,2-bis(4-hydroxyphenyl)propane or polyoxyethylene-2,2-bis(4-hydroxyphenyl)propane.
Claim 6
Dependent Claim
44 words
The color toner according to claim 1, wherein the polyester resin has a glass transition point of 55°-60° C., a hydroxyl value of 12-18, a weight-average molecular weight (Mw) of 14,000-19,000, a number-average molecular weight (Mn) of 5,300-7,500, and an Mw/Mn ratio of 2.0-3.0.
Claim 7
Dependent Claim
14 words
The color toner according to claim 1, wherein the colorant comprises a yellow colorant.
Claim 8
Dependent Claim
28 words
The color toner according to claim 6, wherein the yellow colorant is contained in a proportion of 0.5-7 wt. parts per 100 wt. parts of the binder resin.
Claim 9
Dependent Claim
14 words
The color toner according to claim 1, wherein the colorant comprises a magenta colorant.
Claim 10
Dependent Claim
28 words
The color toner according to claim 8, wherein the magenta colorant is contained in a proportion of 0.1-9 wt. parts per 100 wt. parts of the binder resin.
Claim 11
Dependent Claim
14 words
The color toner according to claim 1, wherein the colorant comprises a cyan colorant.
Claim 12
Dependent Claim
28 words
The color toner according to claim 10, wherein the cyan colorant is contained in a proportion of 0.1-9 wt. parts per 100 wt. parts of the binder resin.
Claim 13
Dependent Claim
13 words
The color toner according to claim 1, further comprising a charge control agent.
Claim 14
Dependent Claim
38 words
The color toner according to claim 12, wherein the charge control agent is a compound selected from the group consisting of salicylic acid metal complexes, alkylsalicylic acid metal complexes, dialkylsalicylic acid metal complexes, and oxynaphthoic acid metal complexes.
Claim 15
Dependent Claim
17 words
The color toner according to claim 12, wherein the charge control agent comprises dialkylsalicylic acid chromium complex.
Claim 16
Dependent Claim
17 words
The color toner according to claim 12, wherein the charge control agent comprises dialkylsalicylic acid zinc complex.
Claim 17
Dependent Claim
17 words
The color toner according to claim 1, which is in mixture with hydrophobic colloidal silica fine powder.
Claim 18
Dependent Claim
17 words
The color toner according to claim 1, which is in mixture with hydrophobic titanium oxide fine powder.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-09-12 | 1998-03-14 | 1998-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-12 | 2002-03-14 | 2002-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-12 | 2006-03-14 | 2006-09-13 | $7700.00 | Window Closed / Lapsed |